Piston 2&3 Cracked ringlands
Hi Guys,
No sings of det on top of the pistons. I was running 260whp 1,3bar boost with these stock pistons. I guess this was their limit overall. https://cimg0.ibsrv.net/gimg/www.mia...4dbf6cc86b.jpg https://cimg1.ibsrv.net/gimg/www.mia...f32742761f.jpg |
When you re-assemble engine add a little more ring gap.
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Originally Posted by Newaza
(Post 1621231)
When you re-assemble engine add a little more ring gap.
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That's really quite impressive. I don't believe I've ever seen that portion of the piston shear off so cleanly.
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Originally Posted by Joe Perez
(Post 1621298)
That's really quite impressive. I don't believe I've ever seen that portion of the piston shear off so cleanly.
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top 0.0216 - 0,55mm
bot 0.0196 - 0,50mm seems no issue here |
Originally Posted by Pieter
(Post 1621397)
top 0.0216 - 0,55mm
bot 0.0196 - 0,50mm seems no issue here However I usually like a little more gap on the bottom ring personally. |
The factory rods are forged but have a relatively small beam cross section and should be upgraded when going to forced induction. What is not commonly discussed is that the factory cast pistons are an equal failure point. The reason is because most upgrade the pistons when they upgrade the rods. When I did the calcs for the ring end gap I was surprised that .020" (.5mm) was barely enough for the top ring. Although .001" of face and bore wear will increase the end gap by .003". The upper ring runs hotter then the second and they can be equal in gap at ambient temp. My recommendation is .020-.022". Ring butting is not common in NA applications but can be in FI. When they butt, they don't just break pistions. The bore will usually show signs of vertical scoring and faces of the end gap become polished.
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